<button type="button" class="btn btn-primary" (click)="collapse.show()"
        aria-controls="collapseManual">Show content
</button>
<button type="button" class="btn btn-primary" (click)="collapse.hide()"
        aria-controls="collapseManual">Hide content
</button>
<hr>
<div id="collapseManual" #collapse="bs-collapse" [collapse]="isOpen"
     class="card card-block card-header">
  <div class="well well-lg">Some content</div>
</div>
